I remember reading once, disciples of Sariputta were going out into the world and he ask them the question: "Friend what if someone ask you is the world eternal or is not eternal". Then his passed his disciples when they just quote Dependent Origination "depending on contact, feeling arises, depending on feeling, craving arises..etc..
I'm trying to look for that sutta again. Anybody know which sutta is it or my memory has been corrupted, there never was such a sutta.